PInvoke access violation, even signature is corret.

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Robert•5/14/24, 10:40 AM

image 1: No matter copy buffer or pass directly.
image 2: PInvoke signature (based on expat.h) XML_Bool = single byte 1 or 0, no matter if i add

[In]

[In]

[In]

[In] attribute

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Robert•5/14/24, 10:41 AM

Always same problem

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Robert•5/14/24, 10:41 AM

While testing the project in unit test works perfectly.

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Robert•5/14/24, 10:41 AM

s_LibName = "libexpat"
calling conv is Cdecl (as defined in XML_CALL macro)

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Robert•5/14/24, 10:43 AM

i had issues while working with XML_Char* too while pasing for example:

    [DllImport(s_LibraryName, CallingConvention = s_CallConv, EntryPoint = "XML_ErrorString")]
    static extern XML_Char* _GetErrorString(Error error);

    [DllImport(s_LibraryName, CallingConvention = s_CallConv, EntryPoint = "XML_ErrorString")]
    static extern XML_Char* _GetErrorString(Error error);

    [DllImport(s_LibraryName, CallingConvention = s_CallConv, EntryPoint = "XML_ErrorString")]
    static extern XML_Char* _GetErrorString(Error error);

    [DllImport(s_LibraryName, CallingConvention = s_CallConv, EntryPoint = "XML_ErrorString")]
    static extern XML_Char* _GetErrorString(Error error);

Instead i set an alias XML_Char* as sbyte and each string i'm creating

new string(sbyteValue)

new string(sbyteValue)

new string(sbyteValue)

new string(sbyteValue) because its null terminated.

In XML_Parse is not null terminated, the buffer is filled when stream read with proper length.

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Robert•5/14/24, 10:45 AM

Same code in unit tests, but don't result in AV.

[TestMethod]
[DataRow("<foo xmlns='bar'/>")]
[DataRow("<foo xmlns='baz'><bar/></foo>")]
[DataRow("<foo xmlns='baz'><bar>content node</bar></foo>")]
[DataRow("<foo xmlns='baz'><!-- a comment --></foo>")]
[DataRow("<foo xmlns='baz'><![CDATA[ a data ]]></foo>")]
[DataRow("<foo xmlns='bar'/>")]
[DataRow("<foo xmlns='baz'><bar/><!-- a comment --></foo>")]
[DataRow("<foo xmlns='baz'><bar>content node</bar><![CDATA[ a data ]]></foo>")]
public void ParseFromString(string xml)
{
    var buf = new byte[4];
    var cnt = 0;

    using var ms = new MemoryStream();
    ms.Write(Encoding.UTF8.GetBytes(xml));
    ms.Position = 0;

    using var parser = new ExpatParser();

    // simulate long I/O  operation (eg: network socket)
    while ((cnt = ms.Read(buf)) > 0)
    {
        parser.Write(buf, cnt, false);
    }

    parser.Write(buf, 0, true);
}

[TestMethod]
[DataRow("<foo xmlns='bar'/>")]
[DataRow("<foo xmlns='baz'><bar/></foo>")]
[DataRow("<foo xmlns='baz'><bar>content node</bar></foo>")]
[DataRow("<foo xmlns='baz'><!-- a comment --></foo>")]
[DataRow("<foo xmlns='baz'><![CDATA[ a data ]]></foo>")]
[DataRow("<foo xmlns='bar'/>")]
[DataRow("<foo xmlns='baz'><bar/><!-- a comment --></foo>")]
[DataRow("<foo xmlns='baz'><bar>content node</bar><![CDATA[ a data ]]></foo>")]
public void ParseFromString(string xml)
{
    var buf = new byte[4];
    var cnt = 0;

    using var ms = new MemoryStream();
    ms.Write(Encoding.UTF8.GetBytes(xml));
    ms.Position = 0;

    using var parser = new ExpatParser();

    // simulate long I/O  operation (eg: network socket)
    while ((cnt = ms.Read(buf)) > 0)
    {
        parser.Write(buf, cnt, false);
    }

    parser.Write(buf, 0, true);
}

[TestMethod]
[DataRow("<foo xmlns='bar'/>")]
[DataRow("<foo xmlns='baz'><bar/></foo>")]
[DataRow("<foo xmlns='baz'><bar>content node</bar></foo>")]
[DataRow("<foo xmlns='baz'><!-- a comment --></foo>")]
[DataRow("<foo xmlns='baz'><![CDATA[ a data ]]></foo>")]
[DataRow("<foo xmlns='bar'/>")]
[DataRow("<foo xmlns='baz'><bar/><!-- a comment --></foo>")]
[DataRow("<foo xmlns='baz'><bar>content node</bar><![CDATA[ a data ]]></foo>")]
public void ParseFromString(string xml)
{
    var buf = new byte[4];
    var cnt = 0;

    using var ms = new MemoryStream();
    ms.Write(Encoding.UTF8.GetBytes(xml));
    ms.Position = 0;

    using var parser = new ExpatParser();

    // simulate long I/O  operation (eg: network socket)
    while ((cnt = ms.Read(buf)) > 0)
    {
        parser.Write(buf, cnt, false);
    }

    parser.Write(buf, 0, true);
}

[TestMethod]
[DataRow("<foo xmlns='bar'/>")]
[DataRow("<foo xmlns='baz'><bar/></foo>")]
[DataRow("<foo xmlns='baz'><bar>content node</bar></foo>")]
[DataRow("<foo xmlns='baz'><!-- a comment --></foo>")]
[DataRow("<foo xmlns='baz'><![CDATA[ a data ]]></foo>")]
[DataRow("<foo xmlns='bar'/>")]
[DataRow("<foo xmlns='baz'><bar/><!-- a comment --></foo>")]
[DataRow("<foo xmlns='baz'><bar>content node</bar><![CDATA[ a data ]]></foo>")]
public void ParseFromString(string xml)
{
    var buf = new byte[4];
    var cnt = 0;

    using var ms = new MemoryStream();
    ms.Write(Encoding.UTF8.GetBytes(xml));
    ms.Position = 0;

    using var parser = new ExpatParser();

    // simulate long I/O  operation (eg: network socket)
    while ((cnt = ms.Read(buf)) > 0)
    {
        parser.Write(buf, cnt, false);
    }

    parser.Write(buf, 0, true);
}

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Robert•5/14/24, 10:46 AM

calling Async from Sync, i'm using .NET aspnet core Async Helper. AsyncHelper.cs

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Robert•5/14/24, 10:52 AM

Setting to .GetAwaiter().GetResult() don't works too

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Robert•5/14/24, 10:54 AM

I know C++ you must use debug with debug and release with release

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Robert•5/14/24, 10:54 AM

but in C# i need to do exactly same?

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Robert•5/14/24, 10:55 AM

even in debug i must use debug libraries? don't make sense, since i'm using exported entries from DLL

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Robert•5/14/24, 10:55 AM

and not linking the library

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Robert•5/14/24, 10:57 AM

Nevermind even using debug libraries same problem happen

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Robert•5/14/24, 10:59 AM

the actual repo https://github.com/nathan130200/Expat

GitHub

GitHub - nathan130200/Expat: C#/.NET libexpat bindings.

C#/.NET libexpat bindings. Contribute to nathan130200/Expat development by creating an account on GitHub.

PInvoke access violation, even signature is corret.

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